Steam generator



STEAM- GENERATOR B/iS/L W0 Y/VIH? INVENTOR.

BY -M Mop ATTORNEY Fly.

June l0, 1952 B. woYNAR STEAM GENERATOR Filed Jan. 27, 1948 2 SHEETS-SHEET 2 BHS/l. W0 Y/V? INVENTOR.

o @om A, memo om@ Patented June 10, 1952 STEAM ensuring'ron` Basil Woynar, Chicago, Ill.; vassigner to Combustion Engineering-Superheater, Inc., 'a-cerpof vration of Delaware .Application January 27, isliaserial No. .4,530

The present invention relates to heat exchange apparatus and particularly to a steam generator of the forced circulation type which is of high capacity and compact construction.

In trains hauled by either electric or dieselrolaim. (C1. 1227-282) l Figures the rignt'hand side of the furnace chamelectric locomotives it is perforee necessary to provide as auxiliary equipment one or more steam generators to heat the cars of the train and for other purposes. motives allocate only a small amount of space for the accommodation of steam generators and, accordingly, it is essential that they be of compact construction and of relatively high capacity.y The limitationspof space also make it difficult to obtain access to the steam generating elements in such installations When it is necessary to inspect or replace them.

In accordance with the present invention compactness of construction is obtained in part by utilizing forced circulation of water through the elements of the generator together with a novel arrangement of these elements which not only minimizes the space that they occupy but also facilitates the removal of a Worn element from the generator when required without substantially disturbing other parts of a diesel motor installation.

The invention will be best understood upon consideration of the following detailed description of the illustrative embodiments thereof, when read in conjunction with the impending drawings.

Figure 1 is a sectional elevational view substantially on the lines I-I on Figs. 2 and 3 of a steam generator constructed in accordance With the present invention.

Figure 2 is a plan view;

Figure 3 is a sectional view on the correspondingly designated section line in Figure 1.

Referring first to Figure 1, the steam generator embodying the present invention has a U-shaped gas passage, one leg of which forms a furnace chamber I downwardly fired by fuel burner means Il and communicating through its inner side wall at the lower end thereof with the adjacent convection passage I2 from the upper end of which the spent gases pass to a stack I3. As shown in Figures 1 and 3 the walls of the furnace chamber I0 are lined with radiantly heated steam generating surface comprising generally flat grid-like tube coils I4, I5, I6, and I1 each made up of a plurality of parallelly disposed pipe lengths disposed in contacting relation to form a water wall and interconnected at adjacent ends by integral return bends to provide for series flow through the tubes making up each coil, one of which is illustrated in Figure 6. As shown in The designers of diesel locober I0' is semi-circular 'and accordingly the coils I4 andV I5 are shaped to arcuate form in order to lie against the wallsl of the furnace.

' The upper end portion 20 of the tube length 2| at one end of V each coil I4-I'I is connected to a water distributing header 22 which, as shown in Figures 2 and 3, is a vtubular member bent to :formy a substantially complete loop extending around the' periphery of the steam generator at its upper end. l Thus, as shown in Figure 2 the water distributing header 22 runs around the three outer sides of both the furnace chamber I0 and convection passage I2 at the upper ends thereof. The upper end portion 23 Vof the tube lengthj24 at theopposite end of each coil M -II isconnected to a collecting header 25 which extends acrossA the top of the steam generator in a position generallyinid-way of the sides of the generator or substantially in the plane dividing the furnace chamber I0 and the convection passage I2.V H

To provide for the flow of gases from the furnace I0 into the convection passage l2 alternate tubes of the coils I6 and I1 that lie along the inner wall of the combustion chamber do not eX- tend clear to the bottom of the furnace in order to provide an outlet opening I8 (Fig. 1) for gases to pass into the convection passage.

As shown in Figures 1 and 3 the steam generating surface in the convection passage I2 consists of several coil units 30, 3|, 32 and 33 made up of tube lengths serially interconnected for fluid flow by return bends and having the constituent tubes disposed in spaced relation in several parallel rows so that the tubes of the element are distributed among several parallel planes. From header 22 Water enters the end portion 34 at the upper end of the initial tube in one of the rows making up each element 30-33 and is discharged into collecting header 25 from the outlet portion 35 at the upper end of the tube forming a fmal part of the element and located at the opposite end of the last row of the several roWs making up the element. The elements 30 to 33 receive water from the portion of supply header 22 that overlies the convection passage I2 and, like the radiant tubes I4 to I'I, discharge into the centrally positioned collecting header 25. Transverse baffles 38 extending horizontally from opposite walls of passage I2 across the coils 30 to 33 deflect the gases so that they flow in a plurality of passes across the convection elements in their travel from thel furnace chamber I0 to the stack I3.

The collecting header 25 discharges the mixture of steam and Water into the separator drum 40 from which the water flows through a down- `comer 4I to the intake of the circulating pump 42 to be fed by the latter through the pipe 43 into the supply header 22. Thus, water taken 5" from the separator drum 40 by the circulating"V pump 42 passes from the distributing header 22 in parallel through six radiantly heated circuits comprising the coils I4 to l1 lining the furnace walls, all of which coils discharge into the collecting header 25. The left end portion of the supply header 22 feeds the convection circuits comprising the four coils 30 to 33 inclusive whose tubes are disposed in the passage l2.

In the event it becomes necessary to removeV any of the steam generating surface the detachment of stack I3 together with the end plates 50, 5| and 52 and the burner assembly Il exposes the coils both in the furnace l0 and convection passage I2. Upon breaking the connectionof collector header with drum 40, the entire steam generating surface may be lifted out of the casing with headers 22, 25 and removed through a hatch 53 in the roof of the engine. If only a single radiant coil requires replacing it may be lifted out 25 'r after .cutting its end portions 20 and 23 from connection with the supply and collecting headers 22 and 25. In similar manner a convection coil to 33 may be lifted out after the end portions 34 and 35 have `been cut from the headers 22 30 and 25.

What I claim is': Y

In a steam generator; a generally rectangular casing including pairs of side and end walls disposed contiguously in upright relation between 35 top and bottom closure walls; a tubular water supplyV header bent into a loop to extend along all of the exterior marginal edges of the upright sideand end walls'of said casing at its upper end;

tion within said loop confronting the end walls of the casing; steam generating tubes connected at their opposite ends directlyy into said headers and depending therefrom with the major portions of their lengths disposed in contacting relation in a row substantially beneath said collecting header to form a wall dividing the interior of said casing into a furnace combustion chamber and an adjacent gas passage; means for introducing fuel into said combustion chamber in a downward direction through the upper end wall of said casing, said tubes being arranged at their lower ends to provi-de Ian outlet disposed above but adjacent said bottom wall for gas flow from said furnace chamber into said gas passage; and other steam generating tubes connected at their ends directly into said headers and depending therefrom into said gas passage.

BASIL WOYNAR.

Y REFERENCES CITED The followingreferences are ofV record in the le of this patent: f

UNITED STATES PATENTS Number Name n Date 1,812,472 Eule June 30, 1931 1,812,966 Lolller July 7, 1931 1,814,605 Mayr July 14, 1931 2,009,852 Lum et al July 30, 1935 2,040,959 Schumann May 19, 1936 2,048,373 Carroll July 21, 1936 2,346,715 Woodard et al Apr. 18, 1944 FOREIGN PATENTS Number Country Date 32,029 Germany June 25, 1885 86,746 Sweden July 7, 1936 France Jan. 22, 1930 

